Just getting my 20 gal terrarium set up for my first ball. It was for a friends cornsnake before, and he gave me a hide just the right size for a hatchling, and a water dish about the same size. I have one side set up to be the warm side with a UTH and one set up to be cooler. I want to have a hide and water dish on both sides but if I buy identical ones it would take up 75% of the floor space in the terrarium. Do the hides and water dishes need to be identical (I read that somewhere), or does it matter so long as they are the proper size? How much actual floor space does a ball need to move around? I don't want to crowd the little guy.